where is the IAC valve!

[Alp Esprit]

Hi there,

Obvious to those who know, but where is the IAC valve and what does it look like?!

Also what does the green plastic thing do that is at the rear of the engine plumbed into the pipes that eminate from under the chargecooler? It it the IAC...!

Thanks,

alp

[Glyn Harper]

The IAC valve is a bronze coloured vacuum capsule that bolts onto the inlet manifold. It has a rod that connects to the throttle body, so you should be able to find it ok. It's under the chargecooler.

The green thing you describe is a filter. It is the crankcase breather filter. Fumes come out of the crankcase, through the filter, and into the airbox.

A lot of people get rid of this and have an oil catch tank instead, or just vent it to atmosphere using a small filter of some kind to stop dirt going into the crank case.

[lotus4s]

IAC is the yellow arrow in the pic. The green arrow is the throttle jack.

[andydclements]

That green filter is my pain at the moment, I can't get one....

It's not ideal to just replace it with an oil catch tank (I already have that), as the idea is that at certain engine conditions the crank case fumes are sucked into the inlet manifold and combusted as part of the normal running, thus it has a small one way valve in that section of the line, as well as the metal plates that act as the filter leading to the air filter for venting to the engine that way.

[Alp Esprit]

thanks guys! got it now

[Qavion]

The crankcase breather valve doesn't always have an internal one-way valve. Some models don't. My 89 SE doesn't have one... therefore, there is nothing to break on it. The filters just needs to be cleaned.

Note: There is a series of circular filters inside. I don't know how important it is to get the order and orientation correct. If the filters don't all fall out when you are disassembling it (they usually do), note their orientation/order.

Cheers.

Ian

[russellbosier]

Regardless of one way valve or not in the seperator, it must be preferable to keep it in the system when a catch tank is fitted to prevent the catch tank from filling so quickly. The tank only needs to catch what the seperator missed.